Preprints
https://doi.org/10.5194/cp-2021-102
https://doi.org/10.5194/cp-2021-102

  10 Aug 2021

10 Aug 2021

Review status: this preprint is currently under review for the journal CP.

Reconstructing Antarctic winter sea-ice extent during Marine Isotope Stage 5e

Matthew Chadwick1,2, Claire S. Allen1, Louise C. Sime1, Xavier Crosta3, and Claus-Dieter Hillenbrand1 Matthew Chadwick et al.
  • 1British Antarctic Survey, High Cross, Madingley Road, Cambridge, CB3 0ET, UK
  • 2Ocean and Earth Science, National Oceanography Centre, University of Southampton Waterfront Campus, European Way, Southampton, SO14 3ZH, UK
  • 3Université de Bordeaux, CNRS, EPHE, UMR 5805 EPOC, Pessac, France

Abstract. Environmental conditions during Marine Isotope Stage (MIS) 5e (130–116 ka) represent an important ‘process analogue’ for understanding the climatic responses to present and future anthropogenic warming. The response of Antarctic sea ice to global warming is particularly uncertain due to the short length of the observational record. Reconstructing Antarctic winter sea-ice extent during MIS 5e therefore provides insights into the temporal and spatial patterns of sea-ice change under warmer than present climate. This study presents new MIS 5e records from nine marine sediment cores located south of the Antarctic Polar Front, between 55 and 70° S. We investigate changes in winter sea-ice extent and sea-surface temperatures between the three Southern Ocean sectors. The Atlantic and Indian sector records have much more variable MIS 5e winter sea-ice extent and sea-surface temperatures than the Pacific sector records. High variability in the Atlantic sector winter sea-ice extent is attributed to high glacial meltwater flux in the Weddell Sea while high variability in the Indian sector winter sea-ice extent results from large latitudinal migrations of the flow bands of the Antarctic Circumpolar Current. Overall, these findings suggest that Pacific sector winter sea ice displays a low sensitivity to warmer climates. The different variability and sensitivity of Antarctic winter sea-ice extent in the three Southern Ocean sectors during MIS 5e may have significant implications for the Southern Hemisphere climatic system under future warming.

Matthew Chadwick et al.

Status: open (until 05 Oct 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on cp-2021-102', Anonymous Referee #1, 10 Sep 2021 reply
  • RC2: 'Comment on cp-2021-102', Oliver Esper, 14 Sep 2021 reply

Matthew Chadwick et al.

Data sets

Marine Isotope Stage 5e diatom assemblages in marine sediment core U1361A (-64.41 degN, 143.89 degE, IODP Exp. 318) M. Chadwick and C. S. Allen https://doi.org/10.5285/FE815073-28EE-462D-BEE3-09E0DA2F3866

Marine Isotope Stage 5e diatom assemblages in marine sediment core TPC290 (-55.55 degN, -45.02 degE, Cruise JR48) M. Chadwick and C. S. Allen https://doi.org/10.5285/D7C00BEA-659A-426E-942F-821F6517C449

Marine Isotope Stage 5e diatom assemblages in marine sediment core ANTA91-8 (-70.78 oN, 172.83 oE, Cruise ANTA91) - VERSION 2 M. Chadwick and C. S. Allen https://doi.org/10.5285/BDA782A6-E89A-41A6-8791-F28001BC5D11

Marine Isotope Stage 5e diatom assemblages in marine sediment core TPC288 (-59.14 degN, -37.96 degE, Cruise JR48) M. Chadwick and C. S. Allen https://doi.org/10.5285/A1A6A674-823E-46F9-B345-6635A0E04220

Marine Isotope Stage 5e diatom assemblages in marine sediment core TPC287 (-60.31 degN, -36.65 degE, Cruise JR48) M. Chadwick and C. S. Allen https://doi.org/10.5285/F8F7BBF7-BD86-45E5-BF22-F7FC327C94BF

Marine Isotope Stage 5e diatom assemblages in marine sediment core PC509 (-68.31 degN, -86.03 degE, Cruise JR179) M. Chadwick and C. S. Allen https://doi.org/10.5285/324137D3-CFC5-4CF6-A360-1A293A3E9ED6

Marine Isotope Stage 5e diatom assemblages in marine sediment core NBP9802-04 (-64.20 degN, -170.08 degE, Cruise PA9802) M. Chadwick and C. S. Allen https://doi.org/10.5285/6106DABC-51AF-41C5-866C-CE8C9E401FD9

Marine Isotope Stage 5e diatom assemblages in marine sediment core MD03-2603 (-64.28 degN, 139.38 degE, Cruise MD130) M. Chadwick and C. S. Allen https://doi.org/10.5285/410F4E27-3214-466F-9DE3-E19848D8C5C2

Marine Isotope Stage 5e diatom assemblages in marine sediment core ELT17-9 (-63.08 degN, -135.12 degE, Cruise ELT17) M. Chadwick and C. S. Allen https://doi.org/10.5285/05DB2C67-99F0-4556-86BF-58B0E84F4CD7

Matthew Chadwick et al.

Viewed

Total article views: 517 (including HTML, PDF, and XML)
HTML PDF XML Total Supplement BibTeX EndNote
405 104 8 517 29 1 4
  • HTML: 405
  • PDF: 104
  • XML: 8
  • Total: 517
  • Supplement: 29
  • BibTeX: 1
  • EndNote: 4
Views and downloads (calculated since 10 Aug 2021)
Cumulative views and downloads (calculated since 10 Aug 2021)

Viewed (geographical distribution)

Total article views: 493 (including HTML, PDF, and XML) Thereof 493 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 21 Sep 2021
Download
Short summary
Algae preserved in marine sediments have allowed us to reconstruct how much winter sea ice was present around Antarctica during a past time period (130 thousand years ago) when the climate was warmer than today. The patterns of sea ice increase and decrease vary between different parts of the Southern Ocean. The Pacific sector has a largely stable sea-ice extent whereas the amount of sea ice in the Atlantic sector is much more variable with bigger decreases and increases than other regions.